膜科学与技术

超支化共聚聚酰亚胺膜制备及其CO2/CH4气体分离性能研究

作者：衣华磊，郭欣，杨涛，高鹏，段翠佳，骆鑫雨

单位： 1中海油研究总院有限责任公司，北京市 100028；2中海油天津化工研究设计院有限公司，天津市 300130；3大连理工大学，大连市 116081

关键词：超支化聚酰亚胺，气体分离，四胺，热酰亚胺化

出版年,卷(期):页码： 2023,43(4):54-59

摘要：

以4,4-六氟异丙基邻苯二甲酸酐（6FDA）和4,4’-二氨基二苯醚（ODA）为基体，通过加入不同比例的N,N,N’,N’-四（对氨基苯基）对苯二胺（NTPDA）四胺单体，采用热酰亚胺化法制备一系列超支化共聚聚酰亚胺膜（6FDA- ODA- NTPDA），通过红外光谱（FT-IR）、热失重分析（TGA）、差示扫描量热法（DSC）、X-射线衍射（XRD）对膜结构进行了表征，并测试了薄膜对CO2/CH4气体渗透性能和分离性能。结果表明：当四胺摩尔分数为5‰时，膜的CO2渗透系数较纯膜（6FDA- ODA）提升117.32%，CO2/CH4选择性较纯膜（6FDA- ODA）提升78.5%。

Adding different proportions of N,N,N',N'-tetra (p-aminophenyl) p-phenylenediamine (NTPDA) tetramine monomers into the 4, 4-hexafluoro-isopropyl phthalic anhydride (6FDA) and 4,4'-diamino-diphenyl ether (ODA) polyimide (6FDA-ODA), a series of hyperbranched copolyimide membranes (6FDA-ODA-NTPDA) were prepared by thermal imimide method. The structure , thermal stability, Tg and crystallinity of the membranes were characterized by infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) respectively. The permeability and separation properties of the membranes for CO2/CH4 gas were tested. The results showed that compared with the pure membrane (6FDA-ODA), when the tetramine mole fraction was 5‰, the CO2 permeability coefficient was increased by 117.32% and the CO2/CH4 selectivity was increased by 78.5% .

衣华磊（1982-），男，高级工程师，2007年毕业于中国石油大学 (华东) ，现主要从事海上平台的设计与研究工作，E-mail：yihl@cnooc.com.cn

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